161173321 has 2 divisors, whose sum is σ = 161173322. Its totient is φ = 161173320.

The previous prime is 161173307. The next prime is 161173339. The reversal of 161173321 is 123371161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83539600 + 77633721 = 9140^2 + 8811^2 .

It is a cyclic number.

It is not a de Polignac number, because 161173321 - 2¹³ = 161165129 is a prime.

It is not a weakly prime, because it can be changed into another prime (161173381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80586660 + 80586661.

It is an arithmetic number, because the mean of its divisors is an integer number (80586661).

Almost surely, 2^161173321 is an apocalyptic number.

It is an amenable number.

161173321 is a deficient number, since it is larger than the sum of its proper divisors (1).

161173321 is an equidigital number, since it uses as much as digits as its factorization.

161173321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 25.

The square root of 161173321 is about 12695.4055075055. The cubic root of 161173321 is about 544.2073273052.

The spelling of 161173321 in words is "one hundred sixty-one million, one hundred seventy-three thousand, three hundred twenty-one".